rb_io_fdopen     1434 ext/socket/ancdata.c                 io = rb_io_fdopen(fd, O_RDWR, NULL);
rb_io_fdopen      552 include/ruby/intern.h VALUE rb_io_fdopen(int, int, const char*);
rb_io_fdopen     1928 ruby.c         	f = rb_io_fdopen(fd, mode, fname);